What is your power supply like? WiFi has very short bursts of high power usage, if this makes your power line sag (because you're e.g. powering your development board over USB through an unpowered USB hub or crappy/long USB cable), the flash chip can brown out leading to this issue.

The Xtensa does support this using interrupt levels; in theory, an interrupt of level 2 can interrupt one of level 1. I'm not sure if our FreeRTOS implementation also honours this, however. In general, with an RTOS, it's preferable to keep your interrupts short and sweet anyway and do most of the pr...

Not using the serial port gdbstub. I seem to remember that jtag may be a better option; it either gives you a good backtrace out-of-the-box or you can get there by reading the exception registers (EPC1, if memory serves).

GPIO16 and 17 probably are connected to the module (because the pins are available on the ESP-Wroom32 module that can also be fitted on the board) but they are not connected inside the esp-wrover module. No idea why the reset button doesn't work. It's known that the reset circuit can be a bit finnic...

We have looked into this. USB is a fairly late addition to the specsheet however (because... well... 'but you have WiFi and BT, that has all the transfer options you need, right?') so apart from the fact that I'm pretty sure we're gonna have USB, I'm not sure what kind of PHY/interface/MAC/... we'll...

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